Rectangular Prism Volume Calculator

Measure length, width, and height in the same unit (feet or meters), then multiply: V = L x W x H. A room 12 ft x 10 ft x 8 ft = 960 cubic feet. This is useful for HVAC sizing, where you need about 1 ton of AC per 400-600 sq ft depending on climate.

Yes, exactly. A rectangular prism, cuboid, and box all use the same formula: Volume = Length x Width x Height. The order of multiplication does not matter (4 x 3 x 2 = 2 x 3 x 4 = 24).

Multiply cubic feet by 7.481 to get US gallons. A rectangular tank 3 ft x 2 ft x 1.5 ft = 9 cubic feet = 67.3 gallons. For liters: multiply cubic feet by 28.317. For cubic meters to liters: multiply by 1,000.

Surface area = 2(LW + LH + WH). A box measuring 4 x 3 x 2 has SA = 2(12 + 8 + 6) = 52 square units. Surface area tells you how much material you need to wrap, paint, or cover the box.

Use consistent units for all three dimensions. If you enter centimeters, the volume is in cubic centimeters (cm^3). If you enter feet, the volume is in cubic feet. Never mix units (e.g., length in meters and width in feet) without converting first.

They are the same shape. A rectangular prism, cuboid, and box all refer to a three-dimensional solid with six rectangular faces and right angles at every corner. A cube is a special case where all three dimensions (length, width, height) are equal. The volume formula V = L x W x H applies to all of these.

Yes, embedding the Rectangular Prism Volume Calculator is free. Hit the "Embed" button on this page, adjust the width, height, and theme, then grab the iframe code. It works on WordPress, Wix, Squarespace, Shopify, and plain HTML pages. No registration needed. Full instructions at calculory.com/services/embed-calculators.